Abstract
Increasing power demand, carbon emission from fossil fuel based generation, depletion of resources, unreliability of power system, poor power quality, low energy efficiency, high transmission losses are the driving factors to move towards smart grid. Smart grid is the integration of electrical grid with information and communication technology and comprises of several micro grid. The micro grids are integrated with main utility grid at point of common coupling using transformers. Such transformer should be of small size for indoor substations. The transformers should have features like bidirectional power flow, real and reactive power flow control and power quality control. Power electronic transformers (PET) are best suited for this application. This paper deals with matrix converter based power electronic transformer which has three phase matrix converter, STATCOM, bilateral converter, dc link capacitor, and voltage source inverter. The main problems of matrix converter based transformers are low input power factor and harmonics. Input power factor and input current harmonic problems are rectified by adding a STATCOM at the input side of matrix converter. Novel space vector based pulse density modulation is designed to obtain harmonic free output voltage in output side of PET. Additionally, the proposed PET performs typical functions and has advantages such as voltage regulation, voltage sag and swell elimination and voltage flicker mitigation. In addition, it has other benefits such as bidirectional power flow, light weight, low volume and no toxic dielectric coolants. Performance of the proposed power electronic transformer is validated by simulation studies.
Published Version
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